Fair Value Measurements - Summary of Amortized Cost and Unrealized (Gains) Losses of Available for Sale Securities (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)
Certificates of Deposit
Amortized Cost
Due within a year	$ 3,046
Due after one year through five years	3,036
Total	6,082
Unrealized gains (losses)
Due within a year	18
Due after one year through five years	27
Total	45
Corporate Bonds
Amortized Cost
Due within a year	59,876
Due after one year through five years	25,126
Total	85,002
Unrealized gains (losses)
Due within a year	292
Due after one year through five years	241
Total	$ 533